4 layers33 × 15.2 mm
2 layers81.3 × 76.2 mm
2-channel Relay
Uttu2611/2-Channel-Relay-Module2 Channel Relay Module Schematic and PCB files.
- Size
- 81.3 × 76.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 31
- Pads
- 81
- Tracks, vias
- 174, 10
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Apr 2026
- Updated
- 5 Apr 2026
Overview
2-channel Relay is an open-source printed circuit board by Uttu2611, from the Uttu2611/2-Channel-Relay-Module repository on GitHub. It is a 2-layer board of 81.3 × 76.2 mm with 23 parts on 31 nets, routed with 174 tracks and 10 vias.
It is built around the WEMOS D1 MINI, LTV-356T and PMBT3904YS. Its parts include 6 resistors, 4 diodes, 4 connectors, 3 ICs and 2 capacitors. It belongs with the home automation and IoT boards and the ESP8266 boards of this library.
Main components
3
WEMOS D1 MINI
A mini wifi board with 4MB flash based on ESP-8266EX, hardware version 4.0.0.LolinUncategorised
LTV-356T
SOP-4-2.54mm-55℃~+110℃ 1 1.2V 200mV@1mA,20mA 3.75kV 3us 4us@2mA,100Ω 50% 50mA 50mA 600% 6V 80V DC Phototransistor SOP-4-2.54mm Transistor, Photovoltaic Output Optoisolators ROHSLite-OnTransistor, Photovoltaic Output Optoisolators
PMBT3904YS
TSSOP-6(SOT-363)-55℃~+150℃ 100 2 NPN 200mA 230mW 300MHz 300mV 40V 50nA 6V NPN TSSOP-6(SOT-363) Bipolar (BJT) ROHSNexperiaBipolar (BJT)
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 200R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R4, R5, R6 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2, R3 |
| 2 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D3, D4 |
| 2 | G5LE-1 | Relay_THT:Relay_SPDT_Omron-G5LE-1 | K1, K2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 2 | LTV-356T | Package_SO:SO-4_4.4x3.6mm_P2.54mm | U2, U3 |
| 2 | Screw_Terminal_01x04 | TerminalBlock_RND:TerminalBlock_RND_205-00003_1x04_P5.00mm_Horizontal | J2, J3 |
| 1 | 10uF/50V | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 22uF/10V | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | Conn_01x03_Pin | Connector_AMASS:AMASS_MR30PW-FB_1x03_P3.50mm_Horizontal | J1 |
| 1 | Fuse | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | PMBT3904YS | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J4 |
| 1 | WEMOS_D1_mini | RF_Module:WEMOS_D1_mini_light | U1 |
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Questions
How big is the 2-channel Relay PCB?
It measures 81.3 × 76.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 2-channel Relay use?
23 parts, built around the WEMOS D1 MINI, LTV-356T and PMBT3904YS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 2-channel Relay KiCad files?
From the Uttu2611/2-Channel-Relay-Module repository on GitHub, at the commit this page was made from: the board is 2-channel_Relay.kicad_pcb and its schematic 2-channel_Relay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 2-channel Relay design in my own project?
Its repository states no licence, so its author keeps all rights: ask Uttu2611 before reusing the design.